Watt's end measuring machine
1776
1776
1794
1785
1776-1780
1776-1780
1776-1780
1778
1785
1785
2000-100 BCE
1782-1793
1784
1778
1777-1785
1782
1787
hallmarked 1788
1775-1785
1785-1789
1783
1784
1785-1790
1781-1790
1790
1775-1795
circa 1780
1990-96
1771
1775
1788
1776-1780
1776-1780
1787
1783
1794
1705-1737
1775-1794
1791
1785
1780
1772 (original); 1919 (model)
4000-2001 BCE
1792
1775-1785
1791-1792
1784
1784
1783
1784
circa 1795